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72 lines
2.4 KiB
Diff
72 lines
2.4 KiB
Diff
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From fc340115ffb8235c1bbd200c28855e6373d0dd1a Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Thu, 19 Apr 2018 18:41:55 +0200
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Subject: [PATCH 6/8] crypto: crypto4xx - properly set IV after de- and encrypt
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This patch fixes cts(cbc(aes)) test when cbc-aes-ppc4xx is used.
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alg: skcipher: Test 1 failed (invalid result) on encryption for cts(cbc-aes-ppc4xx)
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00000000: 4b 10 75 fc 2f 14 1b 6a 27 35 37 33 d1 b7 70 05
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00000010: 97
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alg: skcipher: Failed to load transform for cts(cbc(aes)): -2
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The CTS cipher mode expect the IV (req->iv) of skcipher_request
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to contain the last ciphertext block after the {en,de}crypt
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operation is complete.
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Fix this issue for the AMCC Crypto4xx hardware engine.
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The tcrypt test case for cts(cbc(aes)) is now correctly passed.
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name : cts(cbc(aes))
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driver : cts(cbc-aes-ppc4xx)
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module : cts
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priority : 300
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refcnt : 1
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selftest : passed
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internal : no
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type : skcipher
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async : yes
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blocksize : 16
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min keysize : 16
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max keysize : 32
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ivsize : 16
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chunksize : 16
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walksize : 16
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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drivers/crypto/amcc/crypto4xx_alg.c | 3 ++-
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drivers/crypto/amcc/crypto4xx_core.c | 9 +++++++++
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2 files changed, 11 insertions(+), 1 deletion(-)
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--- a/drivers/crypto/amcc/crypto4xx_alg.c
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+++ b/drivers/crypto/amcc/crypto4xx_alg.c
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@@ -141,7 +141,8 @@ static int crypto4xx_setkey_aes(struct c
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/* Setup SA */
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sa = ctx->sa_in;
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- set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
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+ set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_CBC ?
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+ SA_SAVE_IV : SA_NOT_SAVE_IV),
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SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
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SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
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SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
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--- a/drivers/crypto/amcc/crypto4xx_core.c
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+++ b/drivers/crypto/amcc/crypto4xx_core.c
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@@ -545,6 +545,15 @@ static void crypto4xx_cipher_done(struct
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addr = dma_map_page(dev->core_dev->device, sg_page(dst),
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dst->offset, dst->length, DMA_FROM_DEVICE);
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}
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+
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+ if (pd_uinfo->sa_va->sa_command_0.bf.save_iv == SA_SAVE_IV) {
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+ struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
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+
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+ crypto4xx_memcpy_from_le32((u32 *)req->iv,
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+ pd_uinfo->sr_va->save_iv,
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+ crypto_skcipher_ivsize(skcipher));
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+ }
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+
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crypto4xx_ret_sg_desc(dev, pd_uinfo);
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if (pd_uinfo->state & PD_ENTRY_BUSY)
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